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Types for the PAO extension. The type system <code>PaoTypeSystem</code> adds several new 
methods for boxing and unboxing primitive values. Also, new implementations of 
{@link polyglot.types.ParsedClassType polyglot.types.ParsedClassType} and
{@link polyglot.types.PrimitiveType polyglot.types.PrimitiveType} are provided, to 
implement the functionality that primitive types are now regarded as extending
<code>Object</code>.
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